Set the stamp Size from 2 to 50mm in 1mm steps. The default setting is 10mm.
To see how big a stamp will be, select Single Stamp and move the mouse pointer over your embroidery.
Rotate the stamps to any angle from 0 to 359 degrees. One reason for changing the angle is to get the best result from a stamp, so that any straight lines in the stamp are at a different angle to threads in the embroidery. When you have parallel or nearly parallel lines between the stamp and the threads then fewer stitch points will be placed and the stamp will be less noticeable.
The stamp sample to the right of the Size and Angle boxes shows how the stamp will look. Use Single Stamp to see how the stamp will be used on the embroidery and as a check against parallel lines between the stamp and threads.
Use Vertical Flip 
to mirror the selected stamp from top to bottom.
Shortcuts
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Stamps, Emboss Tab:
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Keys: Alt, E, V
Use Horizontal Flip 
to mirror the selected stamp from left to right.
Shortcuts
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Stamps, Emboss Tab:
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Keys: Alt, E, H